Layer-by-Layer Films for Electrochemical Sensing Applications
Summary
Layer-by-layer (LbL) films have emerged as a versatile platform for constructing electrochemical sensors with high sensitivity and selectivity. By alternately depositing oppositely charged building blocks—such as polyelectrolytes, metal nanoparticles, redox-active dyes or enzymes—researchers can fabricate ultrathin, highly ordered multilayer architectures on electrode surfaces. This modular approach allows precise control over film thickness, composition and porosity, tuning both mass‐transport pathways and interfacial charge transfer. Integration of electrocatalytic nanomaterials into LbL assemblies enhances electron-mediated reactions, lowers overpotentials and sharpens voltammetric responses. The ease of incorporating biomolecular recognition elements further extends applications to glucose monitoring, neurotransmitter detection and environmental pollutant assays. Recent advances have leveraged conductive polymers, two-dimensional materials and functionalised nanoparticles to tailor film conductivity, mechanical stability and biocompatibility. The global significance of LbL-based sensors spans point-of-care diagnostics, food safety screening and on-site environmental monitoring. Continued refinement of assembly protocols—coupled with microfabrication and flow-through formats—promises next-generation devices that combine chemical specificity with rapid, low-cost electrochemical readouts.
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Layer-by-Layer Films for Electrochemical Sensing Applications publication trend
The graph below shows the total number of articles in layer-by-layer films for electrochemical sensing applications across all publications each year (not limited to Nature Index journals).
Technical terms
Layer-by-Layer Assembly: A fabrication technique involving alternate adsorption of oppositely charged species to build up nanoscale multilayers.
Polyelectrolyte: A polymer bearing multiple ionisable groups that can form electrostatic interactions with oppositely charged molecules or surfaces.
Nanocomposite: A hybrid material composed of nanoscale fillers (e.g. metal nanoparticles, carbon nanotubes) dispersed within a continuous matrix.
Cyclic Voltammetry: An electrochemical method where electrode potential is cycled to probe redox behaviour and kinetics of surface-bound species.
Electrocatalytic Activity: The ability of a material to lower the activation energy and enhance the rate of an electrochemical reaction at an electrode surface.
References
- Exploring Deposition Techniques and Supramolecular Arrangement in Thin Films for Sensor Applications. Chemosensors (2023).
- Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors. Beilstein Journal of Nanotechnology (2016).
- Layer-by-Layer Materials for the Fabrication of Devices with Electrochemical Applications. Energies (2022).
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